IP Hotline Connections
From Zenitel Wiki
The IP Hotline comes with either the INCA IP Flush Master board, or the TKIS-2 kit inside.
Turbine Based
Introduction
Input/Output Connections
There are 6 I/O connection options for the IP Hotline Station. These connections can be used to interface with external I/O devices. The connections are typically used as digital input (eg. from a closing contact), digital output (5V), or LED driving (20mA max) for connecting sensors, indicators or integration to other systems.
For more details see Turbine Compact Board Connectors.